190 Degree Engine Coolant Thermostat Assembly

The Motorcraft RT1254 is an engine coolant thermostat assembly designed to regulate engine temperature. It operates at 190 degrees Fahrenheit and is included with the lower housing, water manifold, thermostat housing, and thermostat unit assembly.

This thermostat is specified for various Ford applications, including 6.2L, 5.4L, and 6.8L engines. It fits 1999-2007 Super Duty models, as well as 1997-1999 LD vehicles with 4.6L and 5.4L engines. Additionally, it is compatible with F150 New Style models from 2004-2008 and Mark LT. It also fits F150 models from 1997-2003 and the Heritage 2004 (4.6L, 5.4L).